Pre-compression safety spring pneumatic actuator

Abstract

The utility model discloses a pre-compression safety spring pneumatic actuator, belongs to the technical field of pneumatic actuators, and solves the problems that rigid collision is easy to occur in an internal structure propped against a piston rod in the pneumatic actuator, then the internal structure is damaged, and the displacement of the piston rod needs to be damped in the process. Comprising an upper end cover, a lower end cover, a cylinder body fixedly connected between the upper end cover and the lower end cover, a movable piston connected in the cylinder body in a sliding mode and a piston rod fixedly connected to the movable piston and penetrating through the lower end cover, a spring base is connected to the side, away from the piston rod, of the movable piston in a sealed mode, and a spring cover is fixedly connected to the side, facing the lower end cover, of the upper end cover. The spring cover is fixedly connected with a limiting column penetrating into the spring base. The spring base is pulled through the spring module, air is exhausted from the through hole of the upper end cover, the limiting column is connected with the base in a sealed mode, compressed air provides damping, air is further sucked, the displacement of the piston is increased till abutting, damping is increased, and large impact is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of pneumatic actuators, in particular to a pneumatic actuator with a pre-compression safety spring. Background Art

[0002] Pneumatic actuators are mechanical devices that use compressed air as a power source and are widely used in automated control systems. They use the flow of compressed air to drive the movement of mechanical parts. They usually include a cylinder with a piston inside. The movement of the piston can drive external mechanical devices. The components of pneumatic actuators mainly include cylinders, control valves, air sources, and pipeline systems. The cylinder is the core component of the actuator. It has a piston and a piston rod inside. The piston rod is driven by gas pressure.

[0003] When the current pneumatic actuator draws compressed air, the piston will drive the piston rod to move rapidly under the influence of air pressure, and the force provided in this process is large, so the internal structure of the pneumatic actuator that the piston rod contacts is prone to rigid collision, which in turn causes damage to the internal structure. It is now necessary to damp the displacement of the piston rod in this process.

[0004] Therefore, a pre-compression safety spring pneumatic actuator is proposed to solve or alleviate the above problems. Utility Model Content

[0005] The utility model aims to solve the shortcomings in the prior art and proposes a pre-compression safety spring pneumatic actuator.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A pre-compression safety spring pneumatic actuator comprises an upper end cover, a lower end cover, a cylinder body fixedly connected therebetween, a moving piston slidably connected in the cylinder body, a piston rod fixedly connected to the moving piston and passing through the lower end cover, the moving piston is sealed with a spring base on the side away from the piston rod, the upper end cover is fixedly connected with a spring cover on the side facing the lower end cover, the spring cover is fixedly connected with a limiting column passing through the spring base, the limiting column and the portion where it passes through the spring base are sealed, and air is filled between the spring base and the moving piston.

[0008] Preferably, the outer ring of the limiting column is provided with a spring module, and two ends of the spring module are fixedly connected to the spring cover and the spring base respectively.

[0009] Preferably, one end of the limiting column away from the upper end cover is fixedly connected to a limiting ring located between the spring base and the movable piston.

[0010] Preferably, the outer ring of the open end of the spring base is fixedly connected to a circle of connecting flange, the movable piston is provided with an annular groove on the side facing the upper end cover, an annular sealing gasket is embedded in the annular groove, the connecting flange is embedded in the annular groove, and the connecting flange is set to press the annular sealing gasket.

[0011] Preferably, the movable piston is provided with a fixing bolt passing through the annular sealing gasket and the connecting flange, the fixing bolt is threadedly connected with a positioning nut that presses against the connecting flange, and the side of the movable piston facing the lower end cover is fixedly connected with a buffer gasket covering the screw head of the fixing bolt.

[0012] Preferably, the outer ring of the movable piston is provided with a plurality of annular grooves, and sealing rings are embedded in the annular grooves.

[0013] Preferably, a threaded rod with an outer diameter smaller than that of the piston rod is provided at one end of the piston rod facing the upper end cover, and the threaded rod passes through the movable piston and is threadedly connected to a limiting nut, and the limiting nut presses the movable piston.

[0014] Preferably, a circle of annular embedding grooves is provided on the side of the upper end cover and the lower end cover facing the cylinder body, a sealing member made of silicone material is embedded in the annular embedding groove, and the cylinder body is arranged to press against the sealing member.

[0015] Preferably, it also includes a connecting bolt, which passes through the spring cover and the upper end cover and is threadedly connected with a connecting nut, and the connecting nut is set to press the upper end cover.

[0016] Preferably, it also includes a pull rod fixedly connected to the side of the lower end cover toward the upper end cover, the pull rod has an external thread on one end away from the lower end cover, the pull rod passes through the upper end cover, and the pull rod is threadedly connected to a fixing nut via the external thread, and the fixing nut is pressed against the upper end cover.

[0017] The utility model has the following beneficial effects:

[0018] The utility model pulls the spring base through the spring module to discharge air from the through hole of the upper end cover, the limit column is sealed and connected with the base, the compressed air provides damping, and the air is further sucked, the piston displacement increases until it contacts, the damping increases, and there is no large impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the utility model;

[0020] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0021] Figure 3 for Figure 1 The enlarged view of point B in the middle;

[0022] Figure 4 for Figure 1 Enlarged view of point C in the middle.

[0023] 1. Upper end cover; 2. Cylinder body; 3. Lower end cover; 4. Pull rod; 5. Fixing nut; 6. Spring cover; 7. Connecting bolt; 8. Connecting nut; 9. Limiting column; 10. Spring base; 11. Moving piston; 12. Fixing bolt; 13. Positioning nut; 14. Connecting flange; 15. Annular groove; 16. Annular sealing gasket; 17. Buffer pad; 18. Sealing ring; 19. Spring module; 20. Piston rod; 21. Limiting ring; 22. Limiting nut; 23. Annular groove; 24. Seal. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0025] A pneumatic actuator with a pre-compressed safety spring, such as Figure 1-4 As shown, it includes an upper end cover 1, a lower end cover 3, and a cylinder body 2 fixedly connected therebetween, a movable piston 11 slidably connected in the cylinder body 2, a piston rod 20 fixedly connected to the movable piston 11 and passing through the lower end cover 3, a connecting bolt 7, and a pull rod 4 fixedly connected to the lower end cover 3 toward the upper end cover 1. The pull rod 4 is provided with an external thread at one end away from the lower end cover 3. The pull rod 4 passes through the upper end cover 1 and is threadedly connected to a fixing nut 5 via an external thread. The fixing nut 5 is pressed against the upper end cover 1. A circle of annular grooves 23 are provided on the upper end cover 1 and the lower end cover 3 toward the side of the cylinder body 2. A sealing member 24 made of silicone is embedded in the annular groove 23, and the cylinder body 2 is pressed against the sealing member 24.

[0026] The outer ring of the mobile piston 11 is provided with a plurality of annular grooves, in which a sealing ring 18 is embedded. A threaded rod with an outer diameter smaller than that of the piston rod 20 is provided at one end of the piston rod 20 facing the upper end cover 1. The threaded rod passes through the mobile piston 11 and is threadedly connected to a limiting nut 22, which presses the mobile piston 11.

[0027] The side of the mobile piston 11 away from the piston rod 20 is sealed with a spring base 10, and the side of the upper end cover 1 facing the lower end cover 3 is fixedly connected with a spring cover 6. The connecting bolt 7 passes through the spring cover 6 and the upper end cover 1 and is threadedly connected with a connecting nut 8. The connecting nut 8 is set against the upper end cover 1. The spring cover 6 is fixedly connected with a limiting column 9 that passes through the spring base 10. The limiting column 9 and the spring base 10 are sealed. The spring base 10 and the mobile piston 11 are filled with air. The outer ring of the open end of the spring base 10 is fixedly connected with a circle of connecting Flange 14, an annular groove 15 is provided on the side of the mobile piston 11 facing the upper end cover 1, an annular sealing gasket 16 is embedded in the annular groove 15, the connecting flange 14 is embedded in the annular groove 15, and the connecting flange 14 is set to press the annular sealing gasket 16, a fixing bolt 12 passing through the annular sealing gasket 16 and the connecting flange 14 is passed through the mobile piston 11, the fixing bolt 12 is threadedly connected with a positioning nut 13 that presses the connecting flange 14, and a buffer pad 17 covering the screw head in the fixing bolt 12 is fixedly connected to the side of the mobile piston 11 facing the lower end cover 3.

[0028] One end of the limiting column 9 away from the upper end cover 1 is fixedly connected to a limiting ring 21 located between the spring base 10 and the movable piston 11, and the outer ring of the limiting column 9 is provided with a spring module 19, and the two ends of the spring module 19 are fixedly connected to the spring cover 6 and the spring base 10 respectively.

[0029] When the utility model is actually working, the spring base 10 is pulled toward the upper end cover 1 by the spring module 19 to move, so that the air leaves from the through hole of the upper end cover 1, and in this process, since the limiting column 9 is slidably connected in the spring base 10 and is sealed with the spring base 10, the volume of the limiting column 9 entering the spring base 10 gradually increases, and the air therein is compressed, thereby providing a certain damping for the displacement of the moving piston 11, and if the air in the cylinder body 2 is further sucked through the through hole, the moving piston 11 will further move until the threaded rod and the limiting column are in contact with each other. In the process, since the air in the spring base 10 has been compressed to a certain extent, it has a certain damping effect. Therefore, in the process of exhausting air, the damping will increase accordingly, and the distance between the threaded rod and the limiting column 9 will become smaller, and there will be no greater impact force due to exhausting air. On the contrary, if the cylinder body 2 is inflated and the mobile piston 11 is displaced, although it is necessary to overcome the elastic force of the spring module 19, the air in the spring base 10 begins to expand, so it can offset the elastic force of the spring module 19, so that the mobile piston 11 can be smoothly displaced in the cylinder body 2.

[0030] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A pre-compressed safety spring pneumatic actuator, characterized in that: The invention comprises an upper end cover (1), a lower end cover (3), a cylinder body (2) fixedly connected therebetween, a movable piston (11) slidably connected in the cylinder body (2), and a piston rod (20) fixedly connected to the movable piston (11) and penetrating the lower end cover (3); a spring base (10) is sealedly connected to the side of the movable piston (11) away from the piston rod (20); a spring cover (6) is fixedly connected to the side of the upper end cover (1) facing the lower end cover (3); the spring cover (6) is fixedly connected to a limiting column (9) penetrating into the spring base (10); the limiting column (9) is sealedly arranged at the position where it penetrates the spring base (10); and air is filled between the spring base (10) and the movable piston (11).

2. A pre-compression safety spring pneumatic actuator according to claim 1, characterized in that: The outer ring of the limiting column (9) is provided with a spring module (19), and the two ends of the spring module (19) are respectively fixedly connected to the spring cover (6) and the spring base (10).

3. A pre-compression safety spring pneumatic actuator according to claim 2, characterized in that: One end of the limiting column (9) away from the upper end cover (1) is fixedly connected to a limiting ring (21) located between the spring base (10) and the movable piston (11).

4. A pre-compression safety spring pneumatic actuator according to claim 1, characterized in that: The outer ring of the open end of the spring base (10) is fixedly connected to a circle of connecting flange (14); the movable piston (11) is provided with an annular groove (15) on the side facing the upper end cover (1); an annular sealing gasket (16) is embedded in the annular groove (15); the connecting flange (14) is embedded in the annular groove (15), and the connecting flange (14) is arranged to press against the annular sealing gasket (16).

5. A pre-compression safety spring pneumatic actuator according to claim 4, characterized in that: The movable piston (11) is provided with a fixing bolt (12) penetrating the annular sealing gasket (16) and the connecting flange (14); the fixing bolt (12) is threadedly connected with a positioning nut (13) that presses against the connecting flange (14); and a buffer gasket (17) covering the screw head of the fixing bolt (12) is fixedly connected to the side of the movable piston (11) facing the lower end cover (3).

6. A pre-compression safety spring pneumatic actuator according to claim 1, characterized in that: The outer ring of the movable piston (11) is provided with a plurality of annular grooves, and sealing rings (18) are embedded in the annular grooves.

7. A pre-compression safety spring pneumatic actuator according to claim 1, characterized in that: The piston rod (20) has one end facing the upper end cover (1) provided with a threaded rod having an outer diameter smaller than the outer diameter of the piston rod (20). The threaded rod passes through the movable piston (11) and is threadably connected to a limiting nut (22). The limiting nut (22) presses against the movable piston (11).

8. The pre-compression safety spring pneumatic actuator according to claim 1, characterized in that: The upper end cover (1) and the lower end cover (3) are provided with a circle of annular embedding grooves (23) on one side facing the cylinder body (2), and a sealing member (24) made of a silicone material is embedded in the annular embedding groove (23), and the cylinder body (2) is arranged to press against the sealing member (24).

9. A pre-compression safety spring pneumatic actuator according to claim 1, characterized in that: It also includes a connecting bolt (7), which passes through the spring cover (6) and the upper end cover (1) and is then threadedly connected to a connecting nut (8), and the connecting nut (8) is arranged to press against the upper end cover (1).

10. A pre-compression safety spring pneumatic actuator according to claim 1, characterized in that: It also includes a pull rod (4) fixedly connected to the side of the lower end cover (3) facing the upper end cover (1), the pull rod (4) has an external thread on one end away from the lower end cover (3), the pull rod (4) passes through the upper end cover (1), and the pull rod (4) is threadedly connected to a fixing nut (5) via the external thread, and the fixing nut (5) is pressed against the upper end cover (1).

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